Melt rheology of polylactide/poly(butylene adipate-co-terephthalate) blends
Abstract
Polylactide (PLA) and poly(butylene adipate-co-terephthalate) (PBAT) were melt blended using a twin-screw extruder. The phase morphology of PLA/PBAT blends was observed by scanning electronic microscopy (SEM). The linear and non-linear shear rheological behaviors of PLA/PBAT melts were investigated by an advanced rheology expended system (ARES). The results show that PLA/PBAT blend is a kind of immiscible, two-phase system where PBAT disperses evenly in PLA matrix. Linear viscoelastic limits of PLA/PBAT melts are smaller than that of neat PLA melt. At lower frequencies, storage moduli (G') of PLA/PBAT melts increase with PBAT content. PBAT content has no significant effect on loss moduli (G'') of PLA/PBAT melts, but the relaxation moduli of the melts increase with the introduction of PBAT. At the same time, the incorporation of PBAT results in a gradual increase of the melt viscosity and a decrease of flow activation energy. Besides PBAT causes a decrease of flow index n, which is in conformity with the more serious shear-thinning tendency of PLA/PBAT melts.
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With increasing PBAT content (from 0 to 90 wt.%), G' decreases at lower deformations.
“With increasing content of PBAT (from 0 to 90 wt.%), G’ decreases at lower deformations, which contradicts the observation of Gu et al. [25] with a PBAT content of 0–30 wt.% at 180 °C.”
From Uncompatibilized PBAT/PLA Blends: Manufacturability, Miscibility and Properties (2020) · cites this paper as [25]
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- Authors
- Gu, S.-Y., Zhang, K., Ren, J., & Zhan, H.
- Affiliations
- Tongji University (CN)
- Venue
- Carbohydrate Polymers
- Publisher
- Elsevier BV
- Published
- 2008-10
- Volume
- 74
- Issue
- 1
- Pages
- 79-85
- ISSN
- 0144-8617 (ISSN-L)
- OpenAlex
- W2080400254
- Cited by
- 269
- References
- 1
- Citations by year
- 2026: 8 · 2025: 14 · 2024: 15 · 2023: 17 · 2022: 13 · 2021: 17 · 2020: 16 · 2019: 17 · 2018: 19 · 2017: 28 · 2016: 15 · 2015: 15 · 2014: 9 · 2013: 21 · 2012: 16
- FWCI
- 4.14
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Carbohydrate Polymers (publishedVersion)
- Funders
- Program for New Century Excellent Talents in University
- Topics
- Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
- Physical Sciences › Chemical Engineering › Fluid Flow and Transfer Processes › Rheology and Fluid Dynamics Studies
- Keywords
- polylactic acid, poly(butylene adipate-co-terephthalate), polymer blends, melt rheology, immiscible polymer blends, blend morphology, linear viscoelasticity, storage modulus, loss modulus, relaxation modulus, melt viscosity, flow activation energy, flow index, shear thinning, twin-screw extrusion
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